February 9—March 9. The Sunshine Boys. Neil Simon comedy. The Stage Theatre. 2222 Hewlett Avenue, Merrick. Fridays at 8:30pm, Sundays at 3pm. 516-868-6400.   February 23—March 15. The Sunshine Boys. Neil Simon comedy. A Small Company in America. Salten Hall, NYIT, Northern Blvd. Old Westbury. Fridays, Saturdays 8pm. Sundays, 3pm. 516-686-7894 or www.ascia@mail.com.   March 1—16. The Foreigner. A modern comic farce. Lantern Theatre. Brookside School, Meadowbrook Road, Merrick. Saturday evenings, Sunday matinee. Call for times and reservations. 516-221-4485.   March 2. The Frog Bride. A suspenseful Russian fairytale  Staller Center for the Arts. Stony Brook University. 3pm. 631-632-2787. www.stallercenter.com.     March 15—April 20. Urinetown. Award-winning satirical comedy musical. The Stage Theatre. 2222 Hewlett Avenue, Merrick. Fridays at 8:30pm, Sundays at 3pm. 516-868-6400.   April 5—27. Plaza Suite. Neil Simon comedy.  Theater Three,  412 Main Street, Port Jefferson. Call for times.  631-928-9100 or www.theatrethree.com.     April 26—May 25. A Murder is Announced. Mystery/detective fiction by Agatha Christie. The Stage Theatre. 2222 Hewlett Avenue, Merrick. Fridays at 8:30pm, Sundays at 3pm. 516-868-6400.   May 17—June 21. Urinetown—The Musical. An irreverent satire hailed a the most original mucical in decades.  Theater Three,  412 Main Street, Port Jefferson. Call for times.  631-928-9100 or www.theatrethree.com.   May 31—June 21. The Thief and Old Maid. Opera. A Small Company in America. Salten Hall, NYIT, Northern Blvd. Old Westbury. Fridays, Saturdays 8pm. Sundays, 3pm. 516-686-7894 or www.ascia@mail.com.    May 31—June 29. Grand Hotel. Musical.  The Stage Theatre. 2222 Hewlett Avenue, Merrick. Fridays at 8:30pm, Sundays at 3pm. 516-868-6400.